C
A
A
D
B
A
A
B
A
C
D
D
A
A
A
B
A
A
D
B
B
C
C
B
A
C
A
C
A
B
D
A
A
C
D
A
A
B
A
A
A
A
B
A
A
A
A
A
B
B
B
B
B
C
D